The utility model discloses an improved two-stage depressed collector, which comprises a collector sleeve (1), beryllia porcelain knob insulators (2), a second collector (3), a first collector (4) and a collector sleeve upper cover (5), wherein the beryllia porcelain knob insulators (2) are closely and annularly arrayed on the inner wall of the collector sleeve (1), the second collector (3) and the first collector (4) are mounted above and below the inside of the collector sleeve (1) respectively, and the beryllia porcelain knob insulators (2) include perforated beryllia porcelain knob insulators (2-1) and solid beryllia porcelain knob insulators (2-2). A first collector lead (6) is led out of the first collector (4) to penetrate through the perforated beryllia porcelain knob insulators (2-1) to be connected with a first collector lead joint (7) on the collector sleeve upper cover (5), and a second collector lead (8) is led out of the second collector (3) to be connected with a second collector lead joint (9) on the collector sleeve upper cover (5). The improved two-stage depressed collector is reasonable in structural design, has fine radiation and pressure resistance performances, and is capable of meeting working performance requirements of high-power microwave electron devices.